﻿package xmlTools;

import java.io.File;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class XMLUtil {
	private String fileRoute;

	private static class ErrDocmException extends Exception {
		public String getMessage() {
			// TODO Auto-generated method stub
			return "无法创建Document！";
		}
	}

	private static class ErrNodeValueException extends Exception {
		public String getMessage() {
			// TODO Auto-generated method stub
			return "无法获取该NodeValue！";
		}
	}

	public XMLUtil(String fileRoute) {
		this.fileRoute = fileRoute;
	}

	public String getFirstNodeValue(String nodeName) throws ErrNodeValueException {
		try {
			Document document = this.getDocument(this.fileRoute);
			// 获取包含类名的文本节点
			NodeList nodeList = document.getElementsByTagName(nodeName);
			Node node = nodeList.item(0).getFirstChild();
			String nodeValue = node.getNodeValue();
			return nodeValue;
		} catch (Exception e) {
			e.printStackTrace();
		}
		throw new XMLUtil.ErrNodeValueException();
	}

	private Document getDocument(String file) throws ErrDocmException {
		// 创建DOM文档对象
		DocumentBuilderFactory documentBuilderFactory;
		DocumentBuilder documentBuilder;
		Document document;
		try {
			documentBuilderFactory = DocumentBuilderFactory.newInstance();
			documentBuilder = documentBuilderFactory.newDocumentBuilder();
			document = documentBuilder.parse(new File(file));
			return document;
		} catch (ParserConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		throw new XMLUtil.ErrDocmException();
	}
}
